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Why it isn't my XS 1300 Battery Charging?

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.


Why it isn't my XS 1300 Battery Charging?

This was originally posted on APC forums on 7/14/2012

Yesterday I noticed that the battery icon on the UPS was showing just an outline and is flashing. I turned the audible alarm back on and it is chirping twice in quick succession every 3 seconds. Total load on the unit is ~ 290 - 300 W, so it's nowhere near being overloaded. I don't have a USB - RJ-45 cable, so I can't use PowerChute. I did pull the batteries - 2 x 12V cells in series. My DVOM read 26.25 VDC for the batteries and 27 VDC across the battery cables. To me, the batteries seem to be fine and I don't understand why they're not charging, or why the UPS is not recognizing them as being charged. Naturally the UPS is out of warranty. Any thoughts as to what the problem might be? I don't want to buy new batteries just to confirm that the backup system on this UPS is toast.